Ellipsograph



Nav. 24,1925. 1,562,749 D. L. ERNST ET AL ELLIPSOGRAPH Filed Oct. 27. 1924 AIA' n i i n l i Patented Nov. 24, 1925.

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UNrrED STATES Partnr Fries.

DEE L. ERNST `ANI) HARRY H. ERNST, F EVANSVXLLE, INDIANA.

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Application filed. October 27, 192e. Serial No. 746,165.

To all whom t may concern.'

Be it known that we, Dan L. ERNST and HARRY H. FiRNsT, citizens of the United States of America, and residents of Evansville, in the county of Vanderburg and State of Indiana, have invented certain new and useful Improvements in Ellipsographs, of which the following is a specification.

This invention relates to drawing apparatus, and particularly to an instrument for guiding a marker in certain lines or curves in order that the said marker may be made to draw lines, or curves to produce circles or ellipses, whereby an ellipse of any size or proportion may be drawn.

lt is an object of this invention to produce a so-called ellipsograph having a marker in associated relation to a guide whereby the foregoing objects may be attained; and it is a further object ot' the invention to produce a guide mounting having novel adjustment vertically, and a novel adjustment for oscillating the guide in order that different effects may be produced within the range of the objects stated.

lt is a still further object of this invention to produce an ellipsograph in which provision is made for manipulating the parts expeditiously for accomplishing the results intended.

With the foregoing and other objects in view, theinvention yconsists in the details of construction, and in the arrangement and combination of parts to be hereinafter more fully set forth and claimed.

In describing the invention in detail, reference will be had to the accompanying drawings forming part of this application wherein like characters denote corresponding parts in the several views, and in which- Figure 1 illustrates a view in front elevation of an instrument embodying the invention;

Figure 2 illustrates a side elevation thereof partly in section;

Figure 3 illustrates an enlarged detail View of the marker and itsA mounting partly in section;

Figure 4L illustrates a perspective view of the carriage;

Figure 5 illustrates a perspective view of,

the guide; and n Figure 6 illustrates an enlarged detail sectional view showing the mounting of the master plate.

1n these drawings, 10 denotes a base having suitable feet 11 preferably of rubber, and a needle point 12 to designate the exact center of the ellipse. An upper frame member 13 is held in assembled relation to the base by rods 14 that may be anchored to the base and the upper frame member in any suitable way. A threaded rod 15 is guided by the upper frame member and base and the said threaded rod is preferably rotatably mounted in the said frame member and base. A bracket or arm 16 extends outwardly from-the frame member and it has a socket 17 at its outer edge in which the ball 18 of the marker is mounted so that a ball and socket joint is formed between the marker and the upper frame member, although any suitable `universal joint might be employed as an anchorage for the marker.

T he marker, in the present embodiment of the invention, comprises a tubular element 19 with a spring 20'therein, and the spring is connected to or abuts the shank 21 of the ball 18, and the said spring is operative to exert force longitudinally of the tubular element. Any suitable marker may be inserted in the tube to be engaged by the spring, but the ymarker is here shown as being a pencil-like object 22 which is slidable in the tube with a marking or scribing end 23 which may be pressed into engagement with the object t0 be marked as the marker is manipulated.

The tubular member 19 is held suspended by a spring 24k having its ends anchored to the tubular member by the eye 25 and to the frame member 13 by the eye 26, although any appropriate means may be supplied for accomplishing the result stated.

The marker may be provided with a suitable hand hold or grip 27 in order that it may be manipulated with respect to the guide, as will presently appear.

A carriage 28 has apertures 29 and 30 to. receive the rods 14 respectively by which it is guided, and the said carriage has a threaded aperture 31 which is engaged by the 'threads of the rod 15 for the purpose of moving the said carriage vertically, it being shown that the rod 15 has a knurled handle 32 by which it may be rotated for changing the position of the carriage to produce different results. The carriage has a flange 33 with an aperture 34 in which the shank 35 of a worm 36 is rotatable, the said shank being provided with a knurled handle 37 by which the Worm is rotated to effect an adjustment of the guide 38. The flange of the carriage has apertured ears 39 and 40, the apertures of which are threaded to engage the threads of screws 4l, and the said screws have plain ends 42 forming trunnions on which the marker guide 38 is mounted. Shoulders 43 and 44 are also provided as a part of the carriage or its Harige, and these shoulders constitute abutments for the marker.

The guide 38, which may be termed a masterplate, serves to; engage the marker and to guide the marker, it being understood that if the marker is manipulated and moved while in engagement with the masterplate, the line or curve described by the marker may be determined by the position of the masterplate. By reason of the fact that the masterplate may be moved along said rolls, the outward or inward throw of the marker may be regulated and the size of the curve may thereby be determined. The guide 38, in the present embodiment of the invention, has arms 45 extending` from its sides, the said arms having angular extensions 46, each of which has an aperture 47 to receive a trunnion screw in order that the guide may be oscillatably mounted on the carriage. The guide or masterplate also has a toothed segment y48 attached to its rear side, and the teeth of the segment are engaged by the worm 36 in order that the edge or periphery of the guide may be swung outwardly or inwardly, according to the curve desired. If the adjustment is such that the marker engages the flat face oitl the masterplate and the marker is moved while against the said flat face, the marker will describe a line, whereas if the guide or masterplate is moved so that the marker engages the curved edge of the said guide, the marker when,y moved while in engagement with the said curved edge will describe a curve, according to the adjustment which has been given the carriage vertically, and the adjustment which has been given to the guide or masterplate on its pivots.

le claim:

l. In an ellipsograph, a base, a frame member, guide rods connecting the base and frame member, a carriage having apertures to receive the rods for guiding the said carriage, a threaded rod engaging the carriage and operable to move it along said rods, a masterplate oscillatably mounted on the carriage, means on the carriage for oscillating the masterplate, a marker, a ball and socket connection between the marker and the frame member, means for holding the ball in the socket to permit oscillation of the marker, said marker comprising telescopically arranged sections having means for forcing them axially, and a handle on the marker for manipulating it with respect to the masterplate.

2. In an ellipsograph, a vertically movable carriage, a masterplate having a curved edge, means for oscillatably mounting the masterplate on the carriage, a stationary bracket above the masterplate having a socket, means for supporting the carriage and bracket, a marker having a ball seated in the socket and adapted to cooperate with the masterplate, and means for yieldingly maintaining the ball in the socket, as and for the purpose described.

DRE L. ERNST, HARRY H. ERNST.

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